Carburetor



April l5 ,V 1927. 1,623,682

J. A. JACKSON ET AL `CARBURET0R Filed sept. 18, .1920

/s al l 77 f. Risa/@algn y iioat chamber unit. l

Patented, Apr. 5, Y 1927. l

"UNITED gsra'rsse 1,623,682 PATENT OFFICE? aoHNALrRfEn rAcxsoN AND PArRrcx s'wANsoN, or INVERcARGnn NEWv ZEALAND. v

canse-Raros;

Ap'pncatioa inea september 1s, 1920. .serial No. 411,102.

The object of the invention is to provide an apparatus vwhereby 'and wheremfhydrocarbon fuelis mixed with air so as to pro- `paratus'is charged with vapour of hydro- 'l0` carbon fuel such a way that liquid particles of fuel are eliminated'and the quantity ofvapour to air` can be regulated. j

'The following is ajdes'cription ofour apparatus withreference to the accompany ing drawings, in which :-v Figure 1 is a sectional elevation of the apparatus7 the part omitted being that of the Figure 2 is a plan view of the apparatus. Figure 3 is a perspective View of the valve, regulating the admission of extra air to the secondary mixing chamber,` and of ythe valve seat, and aj portion of itsspindle.

f Figure 4 is a part perspective View of the adjustable tube, showing thejmethod Vof at taching selector and diffuser.

There isa vertically disposed well member `1, having a suitable communication 2 with the liquid fuel supply from Vthe usual floatchamber 3, the arrangement being such thatthefuel is maintained within the well at substantially a `constant level 4, There vis a padof absorbent material in the well l, extendingV from the bottom'lA to above thefpetrol level 4. The well member lis partially partitioned by an adjustable aper- V tured cover 6, disposed in'ithe `well 1 above petrol level, mainly for the purpose ofpro- "tecting the absorbent material `5, and to 40" assist in directing the' induced How lof air from the air passage 9 over thevsaid mate-- rial.

` 'There is an adjustablevertical tube 7, in ternally in the form of a choke or Venturi tube, as indicated at 7A,' the said vertical tube forming a primary mixing chamber, the adjustable tube projects downwardly through the secondary mixing chamber 8,

in a guide aperture SAinfthe wall of the said chamber 8, and' into an air passage 9; the adjustable tube is suspended concentrically over the well 1, the lower portion of the adjustable tube being in close proximityto the absorbent material 5, and over` the aperture 6A in the cover 6. The adjustable tube is smaller in diameter than the well I member 1, andits lower end is provided with a hydro-carbon contact member and diffuser, which is preferablydome shaped and consists offinely meshed supporting material 7C covered with suitable pervi'ous absorbent material 7 B.

Y Ready meansare` provided for 'attaching s and detaching the contact member for `renewal purposes;` the construction being more clearly shown in the enlarged View,

4Figure 4, inwhich the adjustable tube is in dicated at 7, the pervious material 7B, and the wire gauze 7C. The exterior 7E of the lower end yof' the adjustable tube 7 is ta-` pered, and above the taper for a short dis tance is threaded as at171, with which the thread 7y on a detachable union member 7K registers, the lowerend 7L of the said threaded union member being contracted in diameter,` the reduced diameter of thexinterior surface 7M thereof corresponds with the .tapered bottom end of .the adjustabletube 7, butis of greater diameter. to form 'a A space 7N, and the lower end of the internal constructed4 diameter part terminates ina flange providing aseat 7F for the perviousab- `sorbent material 7B and the gauzec, the

mouth `of which is made to suit the taper on the lower end of the adjustable tube 7, and lit into the space 7N left between the said lower tapered end and-contracted interior diameter of the union member.

On screwing the detachable union member home, as indicated in Figure 4, the pervious absorbent*materialand gauze is retain-ed inthe position indicated' in Figure 1. The adjustable tube is adjustable bymeans of the screw 7, The end 7Sfof the said screw TR is secured to the top end' of the adjustable tube 7 which projects therefrom upwards through a nut cap V8C which is detachably iixedy to the body 8E Vof the secondary mixing chamber 8 as indicated at 8D.' The said nut cap is provided with a] threaded aperture to register with the screw 7R.

Means are provided whereby the said screw 7.R may be screwed downwardly and in an upward direction to reduce or increase the area of approximation or contact between the low-er end of the primary mixing chamber and the absorbentmaterial inl the fuel well.

f `The means referred to comprise a universal joint 7T coupling a connecting rod 7u with the screw 7E, the said connecting rod 7U terminates in a knurled control 7V secured to a dash-board (not shown) or the steering column (not shown) of a motor vehicle, so that greater or lesser Contact or approximation may be made between the surfaces of the contact member and of the absorbent material in the well 1 above referred to. rl`he adjustable tube 7 in that portion 7D thereof above the point of aiiixation of the contact member is provided with suitable air inlets 7E forming communication between the air passage 9 and the interior 7F of the adjustable tube 7.

The adjustable tube in its upper portion is provided with suitable outlet apertures 7G forming communication between the interior 7F of the adjustable tube and the secondary mixing chamber 8.

The secondary mixing chamber 8 is provided'with an automatic air valve, comprising a 'valve seat 10, having air inlet apertures 10A, and 'valve 11 slidably mounted on a horizontal spindle 12. The said spindle projects rearwards from the gas outlet 8B across the main air inlet 18, into and through a nut 13 in the rear wall 18^ of the air inlet 18; the end 12A of the spindle 12 is threaded to register with a threaded part of the nut 13, and is long enough yto project so that the jamb nut 14 may be used to lock the unit in the desired position, the adjustment being made by turning the knurled head 15 attached to the end y12A of the horizontal spindle 12.

The medium iniiuencing the adjustment ot the valve :11 comprises two .springs 16 and 17, of different diameters, the larger one 1G is for the purpose of overcoming by its influence the smaller one 17 to create a greater or lesser resistance of the valve 11 against the suction due to the induction stroke of the engine. It will be observed that on turning the threaded projected end 12^ of the spindle 12, as in the manner of screwing va bolt or stud home,'the valve unit will lproject increasingly into the interior of the chamber 8, whereby the pressure of the springs will decrease and the resistance to the opening of the valve diminish. The reverse operation of the spindle 12 increases the resistance of the valve, and thus .the air admission under Athe suction of the engine can be regulated.

Having thus described our invention,what

we claim as new and desire to secure by Letters Patent is l. A carburetor comprising a casing formed with an air inlet and with a partition dividing the casing into an upper and a lower air chamber, a well removably secured at the lowest point ot the casing, means for admitting a liquid hydrocarbon to the well, a mass of absorbent material in the well and extended above the level oi the hydrocarbon therein, a hollow member slidable in said partition in line with the well and adjustable from beyond the carburetor relative to the well, the lower end ot' the hollow member being of mesh material covered with an absorbent layer, that portion of the wall of the hollow member above the mesh material being formed with openings to establish communication between the interior of the member and the lower air chamber, the upper end of the hollow member being formed with openings to establish communication between the interior of said member and the upper air chamber.

2. A carburetor comprising a casing formed with an air inlet and with a :partition dividing the casing into an upper and a lower air chamber, a well removably secured at the lowest point of the casing, means for admitting a liquid hydrocarbon to the well, a mass of absorbent material in the well and extended above the level of the hydrocarbon therein, a hollow member slidablc in said partition in line with the well and adjustable from beyond the carburetor relative to the well, the lower end of the hollow member being ot' mesh material covered with an absorbent layer, that portion ot' the wall of the hollow member above the mesh material being formed with openings to establish communication between the interior o t the member and the lower air chamber, the upper end of the hollow member being formed with openings to establish communication between the interior of said member and the upper air chamber, the interior of the hollow member being of minimum diameter intermediate said sets of openings and of gradually increasing diameter in both directions toward each respective set of openings.

In witness whereof we airix our signatures.

JOHN ALFRED JACKSON. PATRICK SlVANSON. 

